Choosing the right base layer can make all the difference. All of our base layers will help you stay warm, dry, and comfortable no matter where your adventure takes you.

Extreme Cold

When the mercury plunges, our heaviest, ultra-plush fleece layers deliver maximum insulation without suffocating bulk. Engineered with Moisture Transfer Fibers (MTF) and permanent odor control, they trap heat next to your skin while blasting away sweat. Don't let a brutal forecast cut your day short. Lock in maximum warmth and dominate the deep winter.

Women's La Montaña Fleece Zip-T

Heavyweight Active Fit Base Layer

Men's La Montaña Fleece Bottom

Heavyweight Active Fit Base Layer

Boy wearing Hot Chillys La Montaña black fleece zip-neck top and matching black fleece pants, with ski goggles and beanie

Youth La Montana Fleece Zip-T

Heavyweight Active Fit Base Layer

Spring Skiing

Bluebird skies demand a base layer that adapts. These mid-to-lightweight layers hit the ultimate sweet spot between cozy insulation and extreme breathability. Featuring a frictionless face for easy layering and a 4-way stretch, they dump excess heat when you're working hard, but block the breeze on the lift. Say goodbye to the afternoon overheat.

Woman wearing Hot Chillys Micro-Elite Chamois crewneck base layer top in Granite

Micro-Elite Chamois Crewneck

Midweight Body Fit Base Layer

Man wearing Hot Chillys Peach Solid crewneck base layer top in Noche

Peach Skins Crewneck

Midweight Relaxed Fit Base Layer

Kid wearing Hot Chillys youth Pepper Skins base layer bottom in black

Peach Skins Bottom

Midweight Relaxed Fit Base Layer

All Season

Meet the foundation of your outdoor wardrobe. Designed for effortless comfort, these smooth, low-bulk layers prioritize next-to-skin softness and rapid drying. They are thin enough to layer invisibly, yet technical enough to handle a crisp morning run. No matter what the calendar says, this is your year-round go-to.

Woman wearing Hot Chillys Deluxe Tech capri base layer in black

Micro-Elite Chamois Premiere Capri Tight

Midweight Body Fit Base Layer

Men's Bi-Ply Crewneck

Midweight Relaxed Fit Base Layer

Micro-Elite Chamois Print Crew

Midweight Relaxed Fit Base Layer

Sun Protection

Maximize your outdoor time without the burn. Our ultra-lightweight, highly breathable layers feature built-in UPF 50+ to block 98% of harmful UV rays. Crafted with rapid moisture-wicking technology, they act as a cooling shield, keeping you dry, fresh, and protected in the intense sun. From high-altitude hiking to paddleboarding lakes, we've got you covered.

Woman wearing Hot Chillys Micro-Elite Chamois base layer top in white

Micro-Elite Chamois Crewneck

Midweight Body Fit Base Layer

Man wearing Hot Chillys Clima-Tek hoodie and bottom base layer set in dark olive, front view

Clima-Tek Hoodie

Midweight Relaxed Fit Base Layer

Girl wearing Hot Chillys youth Pepper Skins crewneck and bottom base layer set in black

Peach Skins Crewneck

Midweight Relaxed Fit Base Layer